For example, it is not clear at all how a bankruptcy court would treat the transaction.

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For example, it is not clear whether the U.S. military would want a permanent basing arrangement or more flexible intermittent access.

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It is not clear, for example, how such a large position was allowed to build up over the three-month period that the activity was said to be taking place.

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It is not clear, for example, whether an independent Scotland would adopt the euro, which is unpopular thanks to the unfolding crisis on the continent, or sterling, which would mean interest rates still being set in London.

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The volatility of the underlying asset can be difficult to measure or guess, especially since it is not always clear what it is if, for example, it is yet to be invented.

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